22405559 has 4 divisors (see below), whose sum is σ = 24442440. Its totient is φ = 20368680.

The previous prime is 22405547. The next prime is 22405561. The reversal of 22405559 is 95550422.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22405559 - 2²⁰ = 21356983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22405459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1018424 + ... + 1018445.

It is an arithmetic number, because the mean of its divisors is an integer number (6110610).

Almost surely, 2^22405559 is an apocalyptic number.

22405559 is a deficient number, since it is larger than the sum of its proper divisors (2036881).

22405559 is a wasteful number, since it uses less digits than its factorization.

22405559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036880.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 22405559 is about 4733.4510666109. The cubic root of 22405559 is about 281.9152663620.

It can be divided in two parts, 22 and 405559, that multiplied together give a palindrome (8922298).

The spelling of 22405559 in words is "twenty-two million, four hundred five thousand, five hundred fifty-nine".